共查询到19条相似文献，搜索用时 203 毫秒
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基于高频地波雷达长周期适用性比测试验数据,主要从以下3个方面系统分析国产阵列式高频地波雷达矢量流控测效果:(1)时间有效采样率和覆盖率的空间分布;(2)与反演的流速匹配的现场观测深度;(3)不同区域的探测精度.长周期的海流验证表明,雷达海流可以有效地反映有效探测区内表层海流及其时空变化,高精度区流速流向的均方根误差(RMS)分别为7.5～19.3cm/s和15.5°～33.7°,尤其是高精度区核心区域的RMS仅为7.5～10.1 cm/s和15.5°～28.5°.边缘区流速流向的RMS为16.1～25.8 cm/s和39.5°～40.7°,与国内外达到业务化运行要求的同类产品实际观测精度相当. 相似文献
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2013年1月29日至3月15日在台湾海峡西南部海域进行了OSMAR-S100便携式高频地波雷达与浮标观测海流数据的长周期对比试验,验证了雷达系统在探测海流方面的准确性、可靠性和稳定性.通过实测海流与雷达矢量流的复相关分析,选定3 m层的海流为对比代表层.试验期间实测流速为0.0~120.0 cm/s,雷达海流有效探测区内的矢量流流速、流向的观测误差较小,能够满足实时监测海洋表层流的需要,高精度区流速、流向的均方根误差分别为9.1 cm/s和24.8°,边缘区的均方根误差为13.3~24.8 cm/s和39.4°~39.6°,与国内外达到业务化运行要求的同类产品实际观测精度相当. 相似文献
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利用资料同化方法优化观测系统的空间布局:以泰国湾为例 总被引：1，自引：0，他引：1
海洋观测费用高昂，设计科学高效的观测系统可以充分发挥观测的效能。本文以泰国湾高频地波雷达观测系统为例，利用数据同化方法对观测系统进行了最优布局。首先基于FVCOM海洋数值模式建立了泰国湾海域高分辨率三维斜压水动力模式，在此基础上利用一种改进的高效集合卡曼滤波同化方法对岸基高频地波雷达表层海流观测系统开展观测效能评估数值实验。通过观测区域的不同组合方式将3个区域的雷达表层海流数据同化到数值模式中，实验结果表明，岸基高频地波雷达表层海流观测系统可有效降低高分辨数值模式的海流模拟误差。但不同观测区域的组合提供的观测数据对改善海流模拟的作用存在明显差别，泰国湾现有观测系统雷达站位布设方式应进一步优化。本文最后给出了研究区域最优观测站位的布局方案，可作为下一步观测系统进行布局调整的指导。 相似文献
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为解决海流计在实际应用中存在的部分专业术语不规范、译名不统一和归类有差异等问题,促进海洋观测仪器的发展和应用,文章参照相关标准规范、权威专著和专业文献等资料,根据海流计的工作原理和使用性质,结合业界实践经验,系统梳理各类型海流计的命名、分类、适用范围、特点和发展方向等内容。研究结果表明：海流计可定义为“一种用于测量海水流速和流向的仪器”,根据工作原理主要分为机械式海流计、电磁海流计、声学海流计和其他海流计4个大类,不同类型的海流计各具特性;其中,机械式海流计主要包括厄克曼海流计、印刷海流计、照相型海流计、磁录式海流计、遥测海流计和直读式海流计,电磁海流计主要包括地磁场电磁海流计和人造磁场电磁海流计,声学海流计主要包括声学多普勒流速剖面仪、声学多普勒海流单点测量仪、声学多普勒流速仪和时差式声学海流计,其他海流计主要包括激光多普勒测速仪、电阻式海流计、应变片海流计、倾斜式海流计、粒子图像测速仪和海洋湍流剖面仪。 相似文献
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针对舰船在漂航状态(停航不抛锚)时,海流计实测数据不准问题,基于天气海况条件良好的试验海区,分析海流计数据误差原因,提出流速矢量修正海流计实测数据的方法,将修正后结果与《T-D值表》潮流推算值对比发现:13:20时刻的流向误差为0.6%,流速误差为3%;14:20时刻流向误差为1.6%,流速误差为0%,修正效果理想,误差较低,所以此方法对于漂航状态海流测量数据的修正是有效的;由此可知在浅海、近岸海域,漂航状态的舰船在海面风较小时,海流计的测量数据经流速矢量修正后精度较高,可用性较强,可以解决漂航状态海流数据不准问题。 相似文献
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河口海岸测流仪器比测研究 总被引：1，自引：0，他引：1
通过对直读式海流计、ENDECO海流计和ADP测流结果的对比分析表明,ENDECO所测流速比直读式海流计偏小约4.2%,流向偏小2.4%;ADP测得的流速比直读式海流计偏大6.1%,流向偏大3.6%,但ADP测量数据更稳定;由三种仪器测得的涨落潮平均流速相对偏差均在10%左右。三种仪器的观测数据可比性强,同时使用时完全能够相互对比分析。流速小于30 cm/s时,由于仪器的摩擦阻力作用,直读式海流计精度变低;流速大于30 cm/s时,三种仪器测得的结果相差较小。与直读式海流计和ADP相比,ENDECO海流计对流向变化较敏感。 相似文献
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锚泊船只在受到海流、风、海浪等外力作用时其运动规律是很复杂的。大体有下列几种运动:船只绕锚定点的回转运动;绕锚链孔的旋转运动;摇艏运动;纵横向摇摆;升沉运动等。这些运动以各种方式影响测流结果。另外流体绕流现象改变了船只周围的流态,船体磁场对海流计的流向传感器也有影响。一般从事海洋调查的人员,对这些情况是很熟悉的,应当设法消除或减少这些影响。我们的实验表明即使在风平浪静的2～3级海况,这些影响也不容忽视,这时的流速误差可达20％之多;流向误差可达±10°。在实验中我们观测了船艏向,锚链的方位角及入水角参数的时间变化,并作了这些因素对海流测量影响的初步分析。 相似文献
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在测流过程中和资料整理时会有各种各样误差引进。但是,其中有三种误差是主要的: 1.船体的影响。铁船体本身具有磁性。它能改变海流计中磁罗经的方向,船体对表层海流流速也有影响,一般来说铁船体可使流向差的方均根值达30°～49°,流速差的方均根值达4～10厘米/秒。 2.余流是低频的流动,具有3、5、10,15天,甚至更高的变化周期。在一个定点站只观测25小时的海流资料,是得不出准确的余流值,要尽可能延长观测资料的时间序列长度。 3.用观测24小时的海流资料序列来分析余流要比用25小时海流资料序列分析余流误差大,引起最大误差可达±4%。 相似文献
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Josh T. Kohut Hugh J. Roarty Scott M. Glenn 《Oceanic Engineering, IEEE Journal of》2006,31(4):876-884
A network of high-frequency (HF) radars is deployed along the New Jersey coast providing synoptic current maps across the entire shelf. These data serve a variety of user groups from scientific research to Coast Guard search and rescue. In addition, model forecasts have been shown to improve with surface current assimilation. In all applications, there is a need for better definitions and assessment of the measurement uncertainty. During a summer coastal predictive skill experiment in 2001, an array of in situ current profilers was deployed near two HF radar sites, one long-range and one standard-range system. Comparison statistics were calculated between different vertical bins on the same current profiler, between different current profilers, and between the current profilers and the different HF radars. The velocity difference in the vertical and horizontal directions were then characterized using the observed root-mean-square (rms) differences. We further focused on two cases, one with relatively high vertical variability, and the second with relatively low vertical variability. Observed differences between the top bin of the current profiler and the HF radar were influenced by both system accuracy and the environment. Using the in situ current profilers, the environmental variability over scales based on the HF radar sampling was quantified. HF radar comparisons with the current profilers were on the same order as the observed environmental difference over the same scales, indicating that the environment has a significant influence on the observed differences. Velocity variability in the vertical and horizontal directions both contribute to these differences. When the potential effects of the vertical variability could be minimized, the remaining difference between the current profiler and the HF radar was similar to the measured horizontal velocity difference (~2.5 cm/s) and below the resolution of the raw radial data at the time of the deployment 相似文献
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《Oceanic Engineering, IEEE Journal of》2005,30(3):601-618
Wuhan University's ocean state measuring and analyzing radar (OSMAR2000), working at around 7.5 MHz in the low region of the HF band with a 120-m-long linear receiving antenna array, can measure ocean surface current at ranges of up to 200 km. An ocean surface current algorithm based on direction finding (DF) using the multiple signal classification (MUSIC) method is developed for the OSMAR2000 radar. This paper describes the OSMAR2000 ocean surface current algorithm based on MUSIC and the validation experiments in the East China Sea. The results of the ocean surface current measurements demonstrate that the OSMAR2000 ocean surface current algorithm based on MUSIC is feasible for the long range of ocean surface current mapping with a sufficient bearing resolution. 相似文献
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高频地波雷达生成海洋表面矢量流图 总被引：10，自引：0，他引：10
武汉大学研制的双站高频地波雷达系统OSMAR2000利用测得的两幅单站径向海流图生成矢量海流图。经典矢量流图生成方法不能直接应用到OSMAR2000系统中。本文提出一种先在极坐标系下用自然三次样条函数将径向流插值到公共网格上然后直接进行矢量合成的矢量海流图生成方法。OSMAR2000在东海的表面矢量流实测结果与作对比验证的传统海流计测量结果十分吻合。对比数据表明，该方法是可行的，且优于先进行径向流线性插值后矢量合成的矢量流图生成方法。这也是国内首次利用高频地波雷达实现海洋表面矢量流的实时监测。 相似文献
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Akitsugu Nadai Hiroshi Kuroiwa Masafumi Mizutori Shinnchi Sakai 《Journal of Oceanography》1999,55(1):13-30
The Communications Research Laboratory (CRL) has been developing high-frequency ocean surface radars (HFOSRs). The CRL dual-site HFOSR system can clarify the distribution of surface currents with a nominal range of 50 km. This paper presents a theoretical and experimental analysis of the measurement error of the current vector obtained by the CRL HFOSR system, using a comparison of instantaneous current vectors acquired by the HFOSR system and current meters moored at a depth of 2 m, taking account of the vertical current shear. The theoretical analysis shows that the probability distribution of the measurement error of the current vector forms concentric ellipses at a spatial scale that depends on the RMS measurement error of radial current velocity and with an aspect ratio that depends only on the azimuthal difference of the radar beams. When the azimuthal difference is a right angle, the measurement error of the current vector is at a minimum. A comparison between instantaneous current vectors measured by the CRL HFOSR system and moored current meters shows that the distribution of the difference vector between the radar current and the meter current agrees well with the theoretical measurement error of the current vector and that the RMS of difference vector length is about 10 cm s–1 while the azimuthal difference between two radar beams is between 45 and 135 degrees. The accuracy of current measurement by the dual-site HFOSR system is therefore considered to be less than 10 cm s–1 in this range of azimuthal difference. The theoretical analysis will be applicable for a wider range of the azimuthal difference of the radar beams. 相似文献
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Weimin Huang Gill E. Wu S. Biyang Wen Zijie Yang Jiechang Hou 《Oceanic Engineering, IEEE Journal of》2004,29(4):1032-1037
The extraction of full wind vectors from data obtained by single-site (monostatic) high-frequency ground-wave radar (HFGWR) is an ongoing challenge because of the inherent directional ambiguities. Here, a new algorithm for resolving the ambiguity of wind direction from monostatic data is presented. The true wind direction is determined by minimizing the sum of the difference among three wind directions derived from three different radar look angles. The wind directions estimated by applying the algorithm to data obtained from the OSMAR2000 HFGWR situated at the Eastern China Sea are compared with values obtained from ship-borne instrumentation. The mean difference between the ground-truthed values and those obtained from the radar data is approximately 20/spl deg/. The distance limit for wind direction sensing using the OSMAR2000 is about 200 km, which is the range for which signal-to-noise ratios typically exceed about 23 dB in the relevant first-order portions of the backscatter spectra. 相似文献
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投弃式海流剖面测量仪测量原理研究 总被引：1，自引：0，他引：1
根据投弃式海流剖面测量仪的测量原理建立了二维海流运动感生电场离散和连续模型,通过模型推导得到了海流与感生电场间的关系公式。通过对海流感生电磁场的分析,对海流测量的基本方法进行了研究,通过感生电磁场的量级的计算,确定了投弃式海流剖面测量仪研究的主要方向和关键技术。 相似文献
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目前业内普遍使用的机械式海流计功耗大,连续工作时间短,姿态测量精度较低,体积较大,存储容量较小,维护复杂,在需要长时间进行海洋观测使用时十分不便。针对这一实际问题,为提高海流计的性能,设计以STM32f103ZE处理器为核心,运用现代锂离子电池技术,存储技术,传感器技术,无线充电技术,无线通信技术,对机械式海流计电子电路进行了重新设计。样机测试结果表明:该设计功耗低,流向精度高,维护简单且可长时间在水下稳定工作,完全满足各种海洋作业中海流测量需求,具有很大的实用价值。 相似文献
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针对多波束测量声速剖面采样间隔合理选取问题,首先介绍了常声速分层声线跟踪法与常梯度分层声线跟踪法基本原理及实现方式,其次基于两种声线跟踪方法分析了声速剖面采样间隔对多波束测深的影响规律,并利用三次样条插值法对声速剖面进行了层化处理以获取不同采样间隔声剖数据,最后结合限差要求,对采样间隔进行了优化选取,实验结果表明,常声速分层声线跟踪法较常梯度分层声线跟踪法对声剖采样间隔更为敏感,在给定限差范围内合理确定采样间隔,既能保证测量的精度又能提高算法运行效率,分析结果对多波束测深数据采集质量的实时监控和实时声线跟踪具有一定指导作用。 相似文献
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Algorithm for HF radar vector current measurements 总被引：1，自引：0，他引：1
A new algorithm is proposed, called the stream function method (SFM) for producing vector current maps from radial data measured
by dual-site high frequency surface wave radar (HFSWR). In SFM, a scalar stream function is constructed under some oceanographic
assumptions. The function describes the two-dimensional (2-D) ocean surface water motion and is used to obtain the distribution
of vector currents. The performance of SFM is evaluated using simulated radial data, which demonstrates that SFM has advantages
over typical vectorial combination methods (VCM) both in error acceptance and robustness, and excels another method based
on least-squares fitting (LSF) in recovering the complicated current models. Furthermore, SFM is capable of providing the
total currents based on radials from single-site radar. We also test the assumptions of horizontal non-divergence in the simulation.
The new algorithm is applied to the field experiment data of Wuhan University’s ocean state measuring and analyzing radar
(OSMAR), collected in the coastal East China Sea during April 11–17, 2004. Quantitative comparisons are given between radar
results by three current algorithms and in-situ current meter measurements. Preliminary analysis of the vertical current shear is given based on the current meter measurements. 相似文献